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ارزیابی عملکرد لرزهای ترانسفورماتورهای الکتریکی جداسازی شده تحت تحریکات پالسگونه | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 19، دوره 54، شماره 10، دی 1401، صفحه 4007-4034 اصل مقاله (2.85 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2022.21271.7672 | ||
| نویسندگان | ||
| محمد محمودی1؛ عباس قاسمی* 1؛ شهریار طاووسی تفرشی2 | ||
| 1دانشکده مهندسی عمران و منابع زمین، دانشگاه آزاد اسلامی واحد تهران مرکزی، تهران، ایران | ||
| 2دانشکده مهندسی عمران و منابع زمین، دانشگاه آزاد اسلامی واحد تهران مرکزی، تهران، ایران. | ||
| چکیده | ||
| صدمات وارده به ترانسفورماتورهای الکتریکی در زمینلرزههای قدرتمند گذشته، منجر به خسارات اقتصادی غیرقابل جبران و شدیدی شده است. ارزیابی عملکرد لرزهای با بررسی آسیب وارده به کارکرد مناسب ترانسفورماتور، همراه است. در مطالعه حاضر سازههای ترانسفورماتور جداسازی شده به منظور ارزیابی متغیرهایی که بر عملکرد لرزهای و ویژگیهای دینامیکی ترانسفورماتور تأثیرگذار میباشند، مدلسازی و مورد بررسی قرار گرفتند. بر اساس مبانی احتمالاتی و پارامترهای کلیدی تأثیرگذار بر عملکرد لرزهای ترانسفورماتورها، قابلیت پذیرش عملکرد لرزهای سازههای ترانسفورماتور الکتریکی جداسازی شده برای طیف وسیعی از پارامترها مورد بررسی و ارزیابی قرار گرفتند. جهت دستیابی به اهداف مورد نظر در این مطالعه، اثر حرکات پالسگونه نزدیک گسل در جهات افقی و قائم، ظرفیت جابهجایی سیستم جداسازی لرزهای، حالتهای حدی بوشینگهای الکتریکی و جزئیات طراحی سیستم جداسازی بر عملکرد لرزهای لحاظ گردیدند. نتایج این مطالعه نشان میدهد که سیستمهای جداسازی لرزهای سه بعدی در مقایسه با سیستم جداسازی لرزهای افقی مؤثرتر عمل نموده و مقادیر PGA منجر به شکست را تا حداکثر 80 درصد در حرکات پالسگونه حوزه نزدیک نسبت به جداسازی افقی، افزایش میدهند. بنابراین، عملکرد لرزهای سیستمهای جداسازی لرزهای سه بعدی به ازای تمامی پارامترهای مورد مطالعه، بهبود یافته و احتمال شکست به حداقل تقلیل خواهد یافت. | ||
| کلیدواژهها | ||
| ترانسفورماتور الکتریکی؛ جداسازی سه بعدی؛ عملکرد لرزهای؛ حرکات پالسگونه؛ منحنیهای شکنندگی | ||
| موضوعات | ||
| منحنی شکنندگی | ||
| عنوان مقاله [English] | ||
| Evaluation of the seismic performance of isolated electrical transformers under pulse-like excitations | ||
| نویسندگان [English] | ||
| Mohammad Mahmoudi1؛ Abbas Ghasemi1؛ Shahriar Tavousi Tafreshi2 | ||
| 1Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran | ||
| 2Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran | ||
| چکیده [English] | ||
| Damage sustained by electrical transformers in past strong earthquakes led to irrecoverable and severe economic losses. The seismic performance evaluation is associated with the loss of proper functioning of the transformer. This study deals with modeling existing isolated electrical transformer structures to evaluate the effects of variables that may affect seismic performance and dynamic characteristics. The results probabilistically determine the seismic performance acceptability of study isolated electrical transformer structures based on the impact of key structural response parameters on the seismic performance of the transformer. Analyses of systems for a wide range of parameters are performed. The effects of horizontal and vertical near-fault pulse-like ground motions, the displacement capacity of the seismic isolation system, limit states of electrical bushings, and details of the isolation system design are considered. Also, the probability of failure of the transformer under near-fault excitations with pulse-like characteristics is investigated. The results of this study demonstrate that three-dimensional seismic isolation systems can improve the seismic performance for a wide range of parameters and can be further effective compared with only horizontal seismic isolation and offer the lowest probabilities of failure for all cases of transformer and isolation system parameters. | ||
| کلیدواژهها [English] | ||
| Electrical transformer, Three-dimensional isolation, Failure performance evaluation, Near-fault pulse-like ground motions, Fragility curves | ||
| مراجع | ||
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